Operation and repair method of fan type frozen refrigerator

A domestic frozen refrigerator will chiefly have direct-cooled type and fan type
soon. If this refrigerator can be repaired by fan type, a lot of one that is
comes to be able to repair most refrigerators. The structure wants to understand
the movement of the model using the defrost timer of a lot of machine types that
are simply and generally in fan type.

The general one of the schematic diagram of the frozen refrigerator of the
machine type defrost timer is following in fan type. The state the time of just
turning on the power supply of the refrigerator and operating in general is
shown.

When driving, operation usually

The thermostat is being turned on when the frozen refrigerator is not cold. C
and N.C do short to the defrost timer however. (C is abbreviation of Common. N.C
. It is peel Normally Closed abbreviation. )Therefore, the power supply current
of AC100V passes the defrost timer from the thermostat. Fan motor and the
compressor motor work.

At this time, the motor of the clock of the defrost timer flows through the
thermal cutout and the defrost heater the current and always works. A red arrow
shows the current of the defrost timer.

When the refrigerator gets cold enough, the thermostat is turned off. Then,
fan motor and the compressor motor stop. It energizes to the vegetable room
heater, the chilled room duct heater, and the damper heater at the same time,
and these parts are prevented from freezing.

Operation when defrost is driven

Frost adheres to the freezer when the movement of the refrigerator becomes
long. The defrost timer works, and then, C and N.C become OFF however, and,
however, become ON C and N.O. (N.O . It is peel Normally Opened abbreviation.
)At this time, the defrost bimetal does short if cold enough in the freezer.

Therefore, the motor of the defrost timer is short-circuited and stops. And, the
current flows to the defrost heater through the thermal cutout and the defrost
is done. A red arrow shows the defrost current.

The defrost bimetal, the thermal cutout,
the defrost heater, and the movement of the defrost timer are important in the
defrost operation.

Operation after it drives of defrost

The defrost driving stops because the ice of the freezer melts, the
temperature rises, and the defrost bimetal is turned off. A short collapse of
the motor of the defrost timer is divided, and then, the defrost timer flows
through the thermal cutout and the defrost heater the current and starts
operating. There is little generation of heat of the defrost heater by this
current. A red arrow shows the current of the defrost timer.

The thing that the defrost bimetal is turned off, the
thermal cutout, the defrost heater, and the movement of the
defrost timer are important in the end of the defrost operation.

The defrost timer doesn't move after the defrost when the thermal cutout or
the defrost heater cuts, and it doesn't usually permanently return to driving.

The point of contact of the defrost timer operates, and after a while, C and N.C
become ON however and return to usual operation C and N.O OFF however. In a
word, fan motor and the compressor motor drive the power supply current of
AC100V from the thermostat through the defrost timer.

Method of trouble repair and repair example of frozen refrigerator

It is the most important in the repair of the frozen refrigerator to
understand the fundamental motion of the above-mentioned refrigerator. It would
be better to be able to repair naturally if it thinks independently if this is
understood.

The refrigeration room or getting cold the freezer is bad. The cooler fan
might turn and is not occasionally turning.

- Method of diagnosing repair

The drain water is seen whether to come out first of all. ---As follows is
done when there is no drain water. The defrost is not done or the water of the
defrost is blocked or it is either of without the drain water.

Whether garbage is blocked in the point of the drain hose of the place of
the drain bread is checked. ---It removes if there is garbage. If there is no
garbage, it doesn't do the defrost or be blocked more in the interior or be
either.

The interior of the freezer is resolved and the state of the radiator is
checked. ---It seems that the defrost is not done at all when frost attaches to
all aspects and there is no space at all.

It is confirmed whether AC100V has come to the motor of the defrost timer.
The thing that the defrost timer is defective and has stopped is thought when
the defrost is not made with AC100V has come when the compressor turns.

It is normal that AC100V has come to the motor of the defrost timer when the
compressor is working. When it is not so, the thermal cutout or the defrost
heater has been disconnected.

A defrost timer that is upper of the other side of the refrigerator or lower
is turned, it puts into the state of the defrost compulsorily, and it is checked
whether to do the defrost. ---If the heater is seen, it is understood to redden.
It feels after the heater by the hand with Chong for the heater that doesn't
heat red noting the burn.

When the defrost is not done, it is defective of the defrost bimetal or the
thermal cutout or the defrost heater. Whether the defect is understood from the
cable check. At this time, the thing that it is cold enough in the warehouse is
confirmed.

Whenever the thermal cutout has been disconnected, the defrost bimetals are
exchanged at the same time. Otherwise, the thermal cutout is disconnected
moreover.

When the defrost timer is defective, it exchanges it.

When the surrounding of the radiator is frozen, the radiator and ice in the
circumference are completely removed. Ice in the duct ..between the
refrigeration room and the freezer.. also ..completing.. does whether it is
[**]. Ice in the return duct under the freezer also ..completing.. does whether
it is [**]. This is not relieved and easily has a hard time. Refrigeration room
[danpa-sa-mo] also does whether it is [**] and dries ice with the drier.
Otherwise, the damper is frozen.

Stopped up of this side of frozen refrigerator radiator side

- Symptom

The cooler fan that getting cold the freezer is bad is turning. The
compressor is also normal.

- Diagnosis and repair method

When the state of the radiator under the freezer is seen, the radiator on the
air intake side of this side is stopped up. As for becoming like this, the thing
that the door remained opening is thought. whether closing of the door of the
refrigerator is badThe cause is removed. The thing drops in the interior of the
vegetable room and the door in the vegetable room might remain opening a little.

The defrost timer is turned and it puts it in the defrost. Operation is
confirmed. whether to energize to the heater and to do the defrostThe quality of
[baimetarusa-mo] and the thermal cutout can be confirmed.

Whether it is is done to the radiator by the drier of attached ice and
lukewarm water. It is noted to warm only part and not to cut the thermal cutout.
It is confirmed that the drain water comes out in the drain bread. It is
confirmed that the compressor moves automatically after a while. The movement of
the defrost timer can be confirmed.

Author:
Dai IshikawaI am a Business owner of as76.net, and a Engineer.